Units of ${\mathrm{k}}_{\mathrm{c}}$ for $\underset{\left(\mathrm{g}\right)}{\mathrm{xA}}\rightleftharpoons \underset{\left(\mathrm{g}\right)}{\mathrm{yB}}$ is ${\mathrm{lit}}^2{\mathrm{mol}}^{-2}$, then the values of $\mathrm{x} \& \mathrm{y}$ cannot be

Kc​=_​K_f​​/K_b

Kc​=[B]^y​/[A]^x
For option A x=1 y=2 ; Kc​=[mol.l⁻¹]¹[mol.l⁻¹]^2​
For option B; x=3 and y=2; Kc​=[mol.l⁻¹]³[mol.l⁻¹]^2​

For option C; x=2 and y = 3; Kc​=[mol.l⁻¹]²[mol.l⁻¹]³
so, All is correct answer.